CVE-2025-8829
📋 TL;DR
This CVE describes a remote command injection vulnerability in Linksys RE series range extenders. Attackers can execute arbitrary operating system commands by manipulating the 'hname' parameter in the um_red function. All Linksys RE6250, RE6300, RE6350, RE6500, RE7000, and RE9000 devices with firmware up to August 1, 2025 are affected.
💻 Affected Systems
- Linksys RE6250
- Linksys RE6300
- Linksys RE6350
- Linksys RE6500
- Linksys RE7000
- Linksys RE9000
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attackers to install persistent backdoors, pivot to internal networks, or use devices for botnet participation.
Likely Case
Unauthorized access to device configuration, network reconnaissance, or launching attacks against other devices on the network.
If Mitigated
Limited impact if devices are isolated from critical networks and have restricted administrative access.
🎯 Exploit Status
Proof-of-concept exploit code is publicly available on GitHub. Attack requires no authentication and can be executed remotely.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch available. Check Linksys support website for firmware updates. Vendor was contacted but did not respond.
🔧 Temporary Workarounds
Disable Remote Administration
allDisable remote management/administration features to prevent external exploitation
Network Segmentation
allIsolate affected devices on separate VLANs or network segments
🧯 If You Can't Patch
- Replace affected devices with models from different vendors
- Implement strict network access controls to limit device communication to only necessary services
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface at http://[device-ip]/ or via command: telnet [device-ip] (if enabled) and check versionCheck Version:
curl -s http://[device-ip]/ | grep -i firmware || telnet [device-ip] 23Verify Fix Applied:
Verify firmware version is newer than 20250801. No official fix verification available.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/RP_setBasicAuto
- Suspicious command execution in system logs
- Multiple failed login attempts followed by successful access
Network Indicators:
- Unusual outbound connections from range extenders
- Traffic to known malicious IPs from device
- Unexpected SSH/Telnet connections originating from device
SIEM Query:
source="network_device_logs" AND (uri="/goform/RP_setBasicAuto" OR cmd="*hname*")🔗 References
- https://github.com/wudipjq/my_vuln/blob/main/Linksys1/vuln_45/45.md
- https://github.com/wudipjq/my_vuln/blob/main/Linksys1/vuln_45/45.md#poc
- https://vuldb.com/?ctiid.319363
- https://vuldb.com/?id.319363
- https://vuldb.com/?submit.626694
- https://www.linksys.com/
- https://github.com/wudipjq/my_vuln/blob/main/Linksys1/vuln_45/45.md
- https://github.com/wudipjq/my_vuln/blob/main/Linksys1/vuln_45/45.md#poc
